You pass Springfield Bend Lt. (mile 244.8 AHP) at 1242, on 17 October, and estimate the current will average 2.5 mph for the remainder of your trip. What is your ETA at the mouth of the Ohio River if you are making turns for 10.5 mph?
• Relative speed when running with or against current (boat speed through the water vs. speed over ground) • Using river miles to find total distance between two points • Converting time in hours and fractions of an hour into days, hours, and minutes, and then adding to a departure time/date
• Decide whether the current is helping or opposing you based on the direction you are traveling relative to the river flow. How does that change your actual speed made good? • Figure out the total river distance from Springfield Bend Lt. (mile 244.8 AHP) to the mouth of the Ohio River using river miles, then use the basic time formula to find how long the trip takes. • After you get total hours for the trip, carefully convert that to days, hours, and minutes, and then add that to 1242 on 17 October, watching how many times you cross midnight.
• Make sure you correctly calculate speed over ground using: boat speed through the water ± current speed. • Double-check the distance in river miles between the two mileage marks before computing time. • When adding the travel time to the departure, carefully track date changes and ensure the final time and date match one of the options.
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